mean etc

• mean - average
• calculate mean - add all together and divide by number of values
• mean pros - uses all values
• mean cons - influenced by outliers
• median - middle value
• median caluclate - arrange from lowest to highest and find middle
• median pros - useful for ordinal data
• median cons - doesn't use all data
• mode - most commonly occuring data
• mode strengths - useful for nominal
• mode cons - not useful when several modes
• range - minus lowest from highest
• range pro - easy to calculate
• range cons - affected by extreme values
• standard deviation pro - precise measure where all values considered
• standard deviation cons - difficult to calculate
• a normal distribution means that the mode median and mean are all at the same place = at the peak - b

  
• negative skew to the left - mode - median - mean

  
• positive skew - to the right - mode - median - mean